Die-stock.



L; F. HART.

DIE STOCK.

APPLICATION rn-nn 11311, 1910.-

Patented May 2, 1911. z'snnnws snnm -1.

THE NORRIS PETERS ca, wnsmuorou, v. c.

L. F. HART.

- DIE STOCK.

APPLIGATIOH FILED r1311. 21, 1910.

990,864. 'Paterited May'2, 1911.

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THE mamas PETERS cu, WASHINGTON, a. c,

LOUIS F. HART, 0F CLEVELAND, OHIO, ASSIGNOB, TO THE HART MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

Din-screen.

Specification of Letters Patent.

Patented May 2, 1911.

Application filed February 21, 1910. Serial No. 545,066.

To all whom it may concern:

Be it known that 1, Louis F. HART, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Die-Stocks, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The present invention, relating as indicated to die stocks, has more particular re gard to die stocks widely known on the market as Duplex stocks, the general con struction of which is illustrated in U. S. Patents Nos. 263,402 and 686,221. The die stock in question is characterized by having a body member to which the handles, ratchet, or equivalent operating means are attached, and in which are adjustably movably held, a plurality of chaser dies that are utilized to cut the thread. The latter are positioned in such body member by a cam plate rotatably mounted thereon and adapted to be locked in various positions by means of a lock plate or nut, as it is in ef* fect. Guide jaws or blocks are similarly movably mounted in such body member, and like said die blocks are held in desired position by a cam plate that is locked by a second locking plate.

The object of the present invention, is the provision of improved means for adjusting, locking and releasing the cam plate in a die stock of the type just described, and particularly the cam plate whereby the dies are positioned.

A further object is the provision of improved means for preventing undue rotation of the cam plate in the direction to withdraw the dies.

The means for accomplishing the foregoing and related ends will be hereinafter fully described and particularly pointed out in the claims. V

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings :Figure 1 is a front elevation of a die stock embodying my present improvement; Fig. 2 is a broken only be briefly noted. The body member comprises in effect simply a cored out head 1, the outer portion 2 of which is provided with sockets 3 adapted to receive handles 4: for operating the stock, the inner portion of which is in the form of a sleeve 5 that projects beyond such outer portion at each end. Such body is provided with two sets of openings that extend through such inner sleeve portion and are respectively adapted to receive and constitute guides for the chaser dies 6 and guide jaws or blocks 7 Four such dies are shown, and three guide blocks with corresponding openings therefor, but it will be understood that the number, both of the dies and of the guide blocks, may be varied should occasion demand, and a corresponding variation made in the number and location of the openings in the head or body.

The cam plate 8 for positioning the guide blocks is rotatably mounted upon the rearwardly extending end of the sleeve portion 5 of the body, being locked in desired posit-ion by a handled ring 9 threaded on such sleeve in familiar fashion. The die blocks are similarly positioned by means of a cam plate or ring 10 rotatably mounted upon the other end of such sleeve, and it is to the special means for holding the same in'adjusted position thereon, that attention is next desired. Said cam plate 10 is held in place on the sleeve by a retaining ring 11 threaded on the sleeve and locked in place by a set screw 12 so as to restrain the cam plate against endwise movement while still permitting it to rotate. At a convenient point about its pement. The head, moreover, is knurled so as to. permit rotation of the screw by the fingers of the operator under ordinary circumstances. Threaded upon and oscillatory about said screw, intermediately between-the two ears, is a catch or latch 16 of the form shown in Fig. 3, which latch is capable of transverse adjustment within the space defined by the two ears, by rotation of the screw in one direction or other, as will be obvious. The forward end of said catch is designed to engage with a suitable notch 17 formed in a boss or radially extending portion 18 of the cam plates periphery, the preferred form of this notch being that shown in Figs. 1 and 4:. As shown in such Fig.1, but one such notch is utilized, but in Fig.4, a cam plate having a plurality of notches is illustrated. It is designed that the range of adjustment of the catch transversely of the die head, shall be suflicient to provide for the radialadjustment of any set of dies within the range of diameters that is desirable for certain use of such dies. More than one notch, however, is provided where a wider range of adjustment is desired.

In orderto retain the catch in its position of engagement with the notched cam plate, I provide a spring-pressed plunger 19 radially movable in the die head and adapt ed to engage a transverse V-groove 20 in the edge of the catch body. This groove 1s so disposed in such edge that, in the normal position of the catch shown in Fig. 3, it lies onthe inner side of the screw 14 that oscillatorily supports the catch, and the plunger, which. has a corresponding beveled end, either of wedge shape or of the conical form illustrated, is disposed so as to engage the face of the groove farthest from the catch proper and thus operate to force the latter into the notch of the cam plate. This same plunger, in the raised position of the latch, is designed to exert sufficient pressure to retain the same against movement except at the instance of the operator.

The dies 6, it will be observed, are shown as threaded at both ends, this being a desirable construction in stocks of the class in hand. In order tofacilitate their adjustment for cutting on. any particular diameter of pipe, I provide graduations 21 on the narrower sides or edges of said dies, or at least on the edge of one of the same, and arrange .Such registration is arrived at approximately by turning the cam plate through its handle, but is more exactly eiiected, finally, by adjustment of the screw 14 after the latch 16 has been brought into engagement with theproper notch 17 on the cam plate.

The outer ends of the dies, which will project more or less without the body unless the latter be made of an impractical size, it will be observed are protected or guarded in the case of the two uppermost, viewing the device as shown in Fig. 1, by the abutment afforded by the ears 13 which support'the screw and latch; so that, in placing the diestoek on its side, it rests on the end of one handle 4 and on such abutment, instead of on the ends of the dies, which might result in breaking the threads of the latter; this is indicated by the lines g g Fig. 1. Similarly I provide an abutment or guard 23 for this special purpose on the opposite side of the die head so as to protect the ends of the dies that extend on that side as shown by the lines w-m Fig. 1.

The dies may be removed for the purpose of exchange or replacement, by rotating the cam .plate until the pins in the dies, only one of such pins being shown, in order to avoid confusion, in Fig- 1, are brought into the outer ends of grooves 2%. Normally the cam plate is limited in its movement in the direction to thus withdraw said dies, by engagement of a flat spring 24:, mounted on the body of the stock, with a lug 25 on the edge of the plate, Figs. 1 and 2, the spring projecting far enough forwardly from the body to engage one face of such lug. While the latter has one face thus formed for engagement, its other face slopes so as to permit a return movement of the plate past the spring without interference. IV hen it is desired towithdraw the dies, it suflices simply to raise the spring enough to allow the lug to pass.

The advantages of my improved means for adjustably securing the cam plate to the body of the stock, should be apparent without particular description. Not only may the .plate be thus secured in adjusted position for the cutting of threads of any particular diameter, as indicated on the sides of the dies, but the retention of the plate in such position is assured by reason of the positive locking action of the latch. At the same time, a fine degree of adjustment of the dies is permitted so as to cut over or under any particular size, as is at times desirable, such adjustment being made exact instead. of approximate only, as where the handle is relied on entirely for manipulating the cam plate. In order, moreover, to release the die stock from the work as at the end of a cut, it suflices merely to turn back the latch 16, whereupon the cam plate may be rotated to withdraw the dies; and,

upon beginning a new cut, the latter may prevented by the retractable catch 24: which however, may be raised out of the way should it be desired to actually remove the dies from the tool, as has been previously explained.

It will be understood, of course, that other means may be utilized in place of the spring pressed plunger to hold the catch 16 in its operative position. Thus, as illustrated in Fig. 5, a simple flat spring secured to the body of the die stock may be disposed so as to press against the body of the catch with its free end. By way of further variation such catch body is here shown with a lug or transverse rib in place of the notch or groove 20, and the spring is formed so as to engage with such rib.

Uther modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention 1. In mechanism of the character described, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapted to position said dies therein; a catch pivoted on said member about a fixed axis transverse to that of said cam-plate and adapted to engage and secure the latter against rotation; and means for adjusting said catch longitudinally of its axis to thus variously secure said cam-plate.

2. In mechanism of the character described, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapt ed to position said dies therein; said camplate having its periphery notched; a catch pivoted on said member about a fixed axis transverse to that of said cam-plate and adapted to engage a notch in said cam-plate to secure the latter against rotation; and means for adjusting said catch longitudinally of its axis thus variously to secure said cam-plate.

3. In mechanism of the character de scribed, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapted to position said dies therein, said camplate having a plurality of notches in its periphery; a catch pivoted on said member about a fixed axis transverse to that of said cam-plate and adapted to engage either notch in said cam-plate to secure the latter in corresponding position relatively to said member; and means for adjusting said catch longitudinally of its axis to secure said camplate in various intermediate positions.

4-. In mechanism of the character described, the combination of a body member; dies movable in said member; a cam member movably secured to said body member and adapted to position said dies therein; a screw rotatably mounted on one of said members about an axis parallel with the direction of relative movement therebetween, the other member having an engaging element; and a catch having threaded engage ment with said screw and adapted to engage said element to secure said members against relative movement.

5. In mechanism of the character described, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapted to position said dies therein, said camplate having its periphery notched; a screw rotatably mounted on said member about an axis transverse to that of said cam-plate; and a catch having threaded engagement with said screw and adapted to engage a notch in said cam-plate to secure the latter against rotation.

6. In mechanism of the character de scribed, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapted to position said dies therein, said camplate having its periphery notched; a transversely disposed screw rotatably mounted on said member; and a catch both threaded upon and oscillatory about said screw, said catch being adapted to engage a notch in said cam-plate to secure the latter against rotation.

7 In mechanism of the character de scribed, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapted to position said dies therein; a catch pivoted on said member about a fixed axis transversely to that of said camplate and adapted to engage and secure the latter against rotation; means adapted to retain said catch in such engagement; and means for adjusting said catch longitudinally of its axis thus variously to secure said camplate.

8. In mechanism of the character described, the combination of a body member; dies movable in said member; a cam-plate rotatably secured to said member and adapted to position said dies therein, said camplate having its periphery notched; a transversely disposed screw rotatably mounted on said member; a catch both threaded upon, and oscillatory about the axis of said screw, said catch being adapted to engage a notch in said cam-plate to secure the latter against rotation; and a spring-pressed plunger adapted to retain said catch in such engagement.

9. In mechanism of the character de scribed, the combination of a body member;

dies movable in said member; a cam-plate rotatably secured to said member and adapted to positlon said dles therein, sald cam-plate J having its periphery notched; a transversely disposed screw rotatably mounted on said member; a catch both threaded upon, and oscillatory about the axis of said screw, said catch being adapted to engage a notch in said camplate to secure the latter against cam-plate.

10. In a die stock, the combination of a body member having tWo handles respectively projecting from opposite sides thereof; reversible dles movable in said member, the outer ends of said dies normally projecting beyond said member; and oppositely extending projections on said body member intermediate between said handles, lines joining said projections and handles lying Without the corresponding dies whereby said projections are adapted to protect the exposed die ends against contact when the die stock lies on either such side.

Signed by me this 18th day of February,

LOUIS F. HART. Attested by ANNA L. GILL, J NO. F. OBERLIN.

T Copiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

